Neptune is a gas giant composed of helium, hydrogen, ice and methane with a molten ammonia core.
It does not have a solid surface.
Rocky
Neptune is a Jovian planet. Which means it is a gas giant.
Venus is not a gaseous planet. It is a rocky planet covered by cloud.
It's rocky.
Ceres is not a gaseous planet. Ceres is not a planet, it is a dwarf planet. Ceres has a rocky surface.
The "terrestrial planets" are rocky and the "gas giant planets" are gaseous.
Neptune
Uranus is a gas planet.
Neptune is not rocky; it is a gas giant composed mainly of hydrogen and helium. It is very cold due to its distance from the Sun, with temperatures dropping to around -200 degrees Celsius.
Venus is a land (rocky) planet.
No. Pluto is a rocky/icy dwarf planet. In fact, no dwarf planets are gaseous.
Neptune is the smallest of the Gas Giants.